/**
 * Copyright (c) 2012-2013, Michael Yang 杨福海 (www.yangfuhai.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jason.android.core.http.entityhandler;

import org.apache.http.HttpEntity;

import android.text.TextUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class FileEntityHandler
{

    private boolean mStop = false;

    public boolean isStop()
    {
        return mStop;
    }

    public void setStop(boolean stop)
    {
        this.mStop = stop;
    }

    public Object handleEntity(HttpEntity entity, EntityCallBack callback, String target,
            boolean isResume) throws IOException
    {
        if (TextUtils.isEmpty(target) || target.trim().length() == 0)
            return null;

        File targetFile = new File(target);

        if (!targetFile.exists())
        {
            targetFile.createNewFile();
        }

        if (mStop)
        {
            return targetFile;
        }

        long current = 0;
        FileOutputStream os = null;
        if (isResume)
        {
            current = targetFile.length();
            os = new FileOutputStream(target, true);
        }
        else
        {
            os = new FileOutputStream(target);
        }

        if (mStop)
        {
            os.close();
            return targetFile;
        }

        InputStream input = entity.getContent();
        long count = entity.getContentLength() + current;

        if (current >= count || mStop)
        {
            os.close();
            return targetFile;
        }

        int readLen = 0;
        byte[] buffer = new byte[1024];
        while (!mStop && !(current >= count) && ((readLen = input.read(buffer, 0, 1024)) > 0))
        {// 未全部读取
            os.write(buffer, 0, readLen);
            current += readLen;
            callback.callBack(count, current, false);
        }
        callback.callBack(count, current, true);

        if (mStop && current < count)
        { // 用户主动停止
            os.close();
            throw new IOException("user stop download thread");
        }
        os.close();
        return targetFile;
    }

}
